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Lindsey Graham responded to the news of John McCain's brain cancer diagnosis. "This disease has never had a more worthy opponent."

Associated Press

President Trump sent a statement that read, "Senator John McCain has always been a fighter. Melania and I send our thoughts and prayers to Senator McCain, Cindy, and their entire family. Get well soon."

Former Congressman from Michigan's 12th District John Dingell said, "My friend @SenJohnMcCain is a dogged ole S.O.B. Sharp as hell and tougher than a $2 steak. I look forward to catching up with him soon."

Former President George H.W. Bush sent a statement, "The Hanoi Hilton couldn't break John McCain's spirit many years ago, so Barbara and I know, with confidence, he and his family will meet this latest battle in his singular life of service with courage and determination."

Sen. Ted Cruz tweeted, "Heidi and I are lifting up @SenJohnMcCain in prayer. He's an American hero who fought, bled, and suffered for our Nation. A true patriot."

Heidi and I are lifting up @SenJohnMcCain in prayer. He's an American hero who fought, bled, and suffered for our Nation. A true patriot.